Hi all, long time no see!

Last Saturday I got back from vacation, after being away for like 9 days. Only 9 days without driving my Jag.
I go down to the garage and want to unlock it...nothing. Tried the other remote, same thing! And one of them has a nearly new battery... I open the driver's door manually, with the physical key, and try to start the engine...as you can guess: nothing.

So the logical conclusion is my Jag's battery is super dead...hence the following questions:

1. Could charging it overnight with a C-tek MX5S be sufficient to get it to start the next day, or does it need something ballsier to charge it properly?

2. Assuming I use the said ballsier charger, are there any precautions to take? I remember there's a little pipe to release the hydrogen, so the battery shouldn't explode, right? Anything else?

3. My battery is not so old (around 2-2.5 years), so is it normal for it to die in hardly 10 days? Could this be an alternator issue?

Many thanks in advance for your answers!

 

I would start with a 20 to 40 amp charge then when that shows full top off with trickle. Yes there is a vent tube but ideally batter should be removed. 10 days is rather short time. But if there is a draw then that is long enough. These cars wont let anything work as far as i know if voltage is below 10 volts. After charging it would be helpful to load test the battery and see where it stands

 

You MAY get it back to usable after a bunch of work, but it'll never last. You will need a new battery sooner rather than later.

 

I’m starting to think a large group of our members are all part owners of a national battery distribution company.

 

So do you think going flat has significantly shortened its lifespan, like it would for a lithium-ion one?

So I understand you disagree with CJ, right?

 

By draw, do you mean alternator failure or something else?
And how do you do a load test?
Thanks!

 

In a word. Yes.
https://www.varta-automotive.com/kno...--step-by-step

 

this morning.

Having battery load tested in an hour.

Trying to eliminate concerns

 

This old thread is worth reading:
https://www.jaguarforums.com/forum/x...parked-262921/

@Cee Jay is right. Once a battery has been completely discharged, it'll never be able to hold a charge. Winter's coming, and cold weather is a battery killer. Replace your battery with the same type as it was equipped with from the factory, as that's what your alternator was designed to charge. And don't disconnect the vent tube to the outside. It's there for a reason. Hydrogen gas is highly volatile and explosive.

 

Load test was fine.....

Cleaned up all codes too..

Drive and monitor

 

Little update: I charged it with the Ctek for about 20 hours.
It puts out 5A and the battery's capacity (at least the one I have on my XK) is 80 Ah, so that was plenty enough to get a full charge.
Therefore, as could be expected, it started without any problem the next day.
I only had to do the parking break and side windows resets. To my (good) surprise, unlike mentioned in the manual, the seat memories had remained!

 

Keep us posted as to how it holds up over time. Good luck.

 

Shall I understand you're somewhat pessimistic about its survival?

 

I would have put a slow charger on this over a day or so rather than going full gung ho with a 20A charge to get it boosted up, it's just one of those small things when it comes to batteries

 

I guess that's what I did...didn't I?

 

I don't mean to hijack this thread, but I have a similar situation. Battery is less than three years old. It did have a discharge last winter, when in storage the guy storing it disconnected the battery mintainer. Got it charged and load test, all good.
This summer, I have gone to the car on two different occasions and it is as dead as a dodo. Nothing works, so I use the key to get in. Jump the car with a Lithium jump starter, let it run for five minutes, after turning it off, when I try to start it again, it's as if there was nothing wrong with the battery or the electrics!! Solid, healthy turnover the engine fires up great. All electrics work, including the convertible top.
My suspicion and question, does the 2009 XKR Portfolio have a battery saver/disconnect that can disconnect the battery to stop it completely discharging? There is no way the battery I have goes from zero charge to sufficient to restart the car in 5 minutes.
Any other similar situations for other users, if so, what was found ?

Read all the stickies and can't find anything.
Thank
MT

 

I am learning that there are many mysteries and there are many questions that cant be answered..

Kinda like relationships..

 

No. You would have to install an aftermarket switch, but that could cause other problems.

You might have a parasitic current draw. See:
https://www.jaguarforums.com/forum/x...rience-241252/

You may want to have your car diagnosed by a competent auto electrician for who is familiar with the Jaguar X150 model. As I previously explained in my Post #9, above, if a battery has been completely discharged it'll never be able to hold a full charge.

Or, you can save the cost of testing and simply buy a new battery now. Just make sure it's fully charged, as batteries can sit on retailers' shelves for months.

 

So like find one of six people on the planet?

 

Interesting read on parasitic draw. I will be sure to shut down the climate and audio function (and ask my wife to do the same). And monitor the situation. I am certain I double lock the car whenever I have used it, so I don't think that is the culprit.
Went to my files and checked when I bought the battery - May 2024, should definitely be okay, however, I will pull it and get it load tested.
Regarding your comment on a completely discharged battery, not being able to hold a full charge, I am not questioning that. What is most curious to me is the way the car/battery "appears" completely dead, nothing switches on, no display, no alarm, no click of the starter etc etc. BUT after starting it for just a few minutes, she will then fire up with the sound of a well charged battery.
I may go down the "tap a few relays route" it was mentioned in the chasing down the parasitic draw post.
Thanks to all for the feedback, if and when I have any updates, I will post them.